Visible North Korean oil tanker traffic ticked upwards in the second half of July, the NK Pro ship tracker showed, with sanctioned DPRK oil transporters broadcasting their locations numerous times.

The DPRK’s tankers have typically shied away from frequently broadcasting their locations, all apparently going off-grid in mid-2017, beginning when the U.S. Treasury Department issued designations on a Russian company supplying North Korea with oil products.

But three of the North’s oil transport fleet broadcast their locations either transiting between South Korea and Japan or near a Chinese island off the coast